Machine for dissolving xanthate



Jan. 7, 1930. R. THURM ET AL- MACHINE FOR DISSOLVING XANTHATE Filed Sept. 10. 1927 2 Sheets-Sheet INVENTOR8 Earls/w: Sal-415215;; Plum); 0 THUR/Y).

ATTORNEY Jan. 7, 1930. R. THUR M ET AL 1,742,226

MACHINE FOR DI SSOLVING XANTHATE Filed Sept. 10, 1927 2 Sheets-Sheet 2 F 12 INVENTORS ATTORN EY Patented Jan. 7, 1930 RICHARD THURM AND EUGENE SCHMIERER, F SAGINAW, MICHIGAN, ASSIGNORS '10 BAKER PERKINS COMPANY, INC., 01F SAGINAW, MICHIGAN, A CORPORATION OF NEW YURK MACHINE FOR DISSOILVING XANTHATE Application filed. fieptember 10, 192?. Serial No. 218,753.

, of the kind shown and described in our coltl ll-(l all pending application Serial No. 151,488, filed November 29, 1926.

That machine comprises a dissolver bowl for containing the fluid material and an openended drum fixed upright in the bowl and spaced above its bottom. Near the lower end of the drum is a bladed impeller coaxial with the drum and rotatable in proximity to a series of stationary radial bars, so the contiguous edges of the bars and of the impeller blades co-operate to shear between them the pieces of material that pass with the liquid through the drum. The individual masses to be dissolved are mechanically reduced to small pieces while they are in suspension and during their uninterrupted circulation. A maximum of dissolving efiect takes place upon the freshly exposed areas. The machine above referred to is highly eficient, especially during the earlier stages oi the reducing and dissolving operations.

Uur present improvement furnishes additional means for improving the eflectiveness and increasing the capacity of a mixer of the kind referred to, especially during the later stages of dissolving when the material pieces are small and soft and are suspended in liquid that has become quite thoroughly saturated with the dissolved material.

This result is attained by a material reducing screen or grille-like structure through which the impeller blades force the fluid after the suspended pieces have been acted on by the blades. The flow resistance of the grille keeps the larger pieces of material a longer time in the vicinity of the revolving blades. Moreover, the blades themselves are shaped so their outer edges, and even their bottom edges, are utilized as reducing or cutting members to decrease the size of the suspended pieces with each recirculation of the material through the drum.

Our invention provides an additional grille whereby even the finely divided particles that remain in suspension toward the completion of the dissolving operation are similarly retarded and reduced. This second grille is a screen-like member that can be positioned at will to co-operate with the firstmentioned grille by forming a finer mesh and consequently a more retardant member through which the fluid in its nearly finished condition must pass.

During the early stages of the operation, while the pieces are large, the second grille is moved out of the way.

The invention provides means by which the operator can put the movable grille into and out oil action.

With the foregoing-and certain other ohjects in view, which will appear later in the specifications, our invention. comprises the devices described and claimed and the equivalents thereof.

lln the drawings Fig. l is a part diagrammatic vertical section oil a dissolver with our improvement applied thereto.

'ltig. 2 is a topplan view of the lifting mechanism for the movable grille.

Fig. 3 is a side view oi the same.

l ig. l is a sideelevation showing a tragmentary view of the stationary and movable grilles, the latter in raised position.

Fig. 5 is a similar view, with the movable grille lowered.

Figs. 6 and 7 are plan views of the stationary and movable grilles respectively.

Fig. 8 is a detail of a grille finger.

Figs. '9 and 10 are part sectional detail views of a machine embodying modified shapes and arrangements of the impeller blades.

Fig. 11 is an enlarged plan view showing the bafies used in the bottom of the bowl.

Fig. 12 is an end view of some of the bames shown in Fig. 11.

Numeral l designates the usual approximately egg-shaped dissolver bowl having a central vertical spindle 2 adapted to be rotated by any suitable means, not shown.

Numeral 3 designates a bladed impeller, the upper edges 3 of the blades all being in the same plane and acting as shear blades in conjunction with stationary cutting bars l.

The central drum 5, open at both ends, is supported by the legs 6 fastened to the bottom of the bowl 1, as shown in Fig. 1.

The machine so far described is the device of our earlier application, to which the following improvements are added, for the purposes already set forth.

A material reducing device, for example, a finger grille 7, is fixed to the lower end of the drum, its fingers 8 spaced quite far apart and extending down to near the bottom of the bowl. This grille serves to reduce, but does not seriously obstruct the flow of fluid during the earlier stages of the dissolving operations when the suspended pieces of material are large. The retarded flow causes such larger pieces to be reduced in size a greater number of times at each passage through the impeller thus increasing the hourly capacity of the machine.

As the pieces get smaller a finer mesh grille is required to produce the desired retardance. Therefore, an auxiliary grille is provided which can be lowered into position when a finer mesh becomes desirable.

The movable grille has fingers 9 quite close together. They are arranged in groups intermediate the fingers 8 of the stationary grille, as shown in Figs. 4 and 5. The fingers 9 are secured to a vertically movable ring 10 which can be raised and lowered from above by means of links 11 and handle 11 pivotally mounted on the top 13 of the dissolver bowl.

When raised, as shown in Fig. 4, the fingers 9 offer no obstruction to the flow, but when lowered, as indicated in Fig. 5, all the material forced outward by impeller 3 must pass through the fine mesh rille that includes all the fingers, and the increased retardation causes the impeller blades to divide the small pieces of suspended material much more frequently.

To further increase the shearing capacity of the impeller blades I prefer to make them with upright outer shearing edges 14, as shown in Figs. 1, 9 and 10, the grille fingers 8 and 9 co-operating with the blade ends 14 to perform additional dividing operations.

A still further means for increasing the amount of reduction and agitation at the impeller blades is shown in Figs. 9, 10, 11. It consists in utilizing the lower'edges 15 of the impeller blades as working members in cooperation with stationary rib-like bars 16 mounted on the bottom of the dissolver bowl. These bottom edges 15 may be curved, as shown in Fig. 9, in which case t e ribs 16 are correspondingly curved, or the ottom edges may be straight, as shown in Fig. 10. By utilizing the outer edges 14 and the lower edges 15 of the impeller as shearing members in addition to the top edge 3, as set forth in our previous application, the amount of dividing or reducing performed by the impeller in a iven time is greatly increased. By us- 65 ing t e coarse mesh grille 8 as a flow retarddrum and a material-reducing impeller, flowretarding means adapted to decrease the rate of flow of said material away from the impellcr comprising a grille arranged as a circular wall outside of and close to the path of travel of the tips of the impeller, for the purposes set forth.

2. In a dissolver including a circulating drum and a material-reducing bladed impcller, flow-retarding means in the path of normal travel of the material, adapted to decrease the rate of flow of said material away from the impeller comprising a cylindrical wall outside of and close to the path of travel of the tips of the impeller blades, said tips constituting shear edges for subjecting the material to an increased degree of reducing action.

3. In a dissolver including a circulating drum and a materiahreducing impeller, flowretarding means comprising a finger-grille adapted to decrease the rate of flow of said material away from the impeller, for the purposes set forth.

4. In a dissolver including a circulating drum and a material-reducing impeller, flowretarding means comprising spaced fingers disposed around the bottom edge of the drum in the path of normal travel of the material, said fingers adapted to decrease the rate of flow of said material away from the impeller and constituting means for subjecting the material to an mcreased degree of reducing action.

5. In a dissolver including a circulating drum and a material-reducing impeller, flowretarding means comprising downwardly ex tending spaced fingers secured to the bottom 115 edge of said drum adapted to decrease the rate of flow of said material away from the impeller. a movable finger grille, and means for moving the same into and out from cooperative relation with said Spaced fingers,

for the purposes set forth.

6. In a dissolver including a circulating drum and a material-reducing impeller, a flow-retarding finger grille fixed in the path of" normal travel of the material, adapted to 12 decrease the rate of flow of said material away from the impeller and constituting means for subjecting the material to an increased degree of reducing action, and a vertically movable grille having groups of fingers thereon adapt- 1 all meaaae ed to be placed in spaced relation to the fingers of said first-mentioned grille.

7. In a dissolver including a circulating drum and an impeller having a material-reducing edge at the end of each of its blades, a stationary flow-retarding grille and a movable grille co-operating therewith and with blades, means for subjecting the material to an increased degree of reducing action.

9. In a dissolver including a circulating drum and a material-impeller, flow-retarding means adapted to decrease the rate of flow of said material away from the impeller, and auxiliary flow-retarding means and actuating devices therefor for moving the same into and out of co-operative relation with said firstmentioned flow-retarding means, for subjecting the material to an increased degree of reducing action.

10. In a dissolver including a circulating drum and an impeller having a material-reducing edge at the end of each of its blades, a stationary flow-retarding grille in co-operative relation with said impeller, for the purposes set forth.

tures.

RICHARD THURM. EUGENE SCHMIERER.

In testimony whereof, we ailix our signa- 

